I think if they indicate a load which is potentially the most accurate, it may not be reflected in your gun. The loading book is still good, but its probably best to have more than one anyways.
I think you can google a bullet stability program, I used it when I had trouble grouping 55 grain bullets, which my loading book suggested as a good starting point.
Turns out, based on the twist of my rifle, the bullets weren't stabalizing properly, after I switched to 45 and 50 grainers, it was much better.
If no lock, pm email and I can email you the program I have, its just a locked down excel sheet, but a useful tool nonetheless.
Cheers